wahoo Mac is the best, IMHO
.
it won't take long to get used to, and you will love every minute of it. I used to design across both mac and pc and mac far outweighs pc, for me.
I'm pretty sure you can use a USB mouse as the mac mice are now blue toothed and have no attached wire so need to be recharged once in a while (through the computer, not battery operated) but just make sure your mac has a usb port. the new laptops don't... you would have to buy an attachment that gives you usb ports.
other than that, enjoy enjoy enjoy xx